Feeding paper to printing-presses



(No Model.)

J. A. DEAR. FEEDING PAPER T0 PRINTING PRESSES, FOLDING MACHINES, @w.

No. 452,024. Patented May 12, 1891.

. "NITED S'lATES-ATENT Fr es.

JOSEPH A. DEAR, OF JERSEY CITY, NEW JERSEY,

FEEDING PAPER T P RINTING-PRESSES, FOLDING-MACHINES, &C-

SPECIFICATION forming part of Letters Patent No. 452,024, dated May 12,1891.

Application filed March 25, 1889- Serial No. 304,621. (No model.)

To all whom it may concern.-

Be it known that I, JOSEPH A. DEAR, of Jersey City, in the county ofHudson and State of New Jersey, have invented an Improvement in FeedingPaper to Printing- Presses, Folding-Machines, &c., of which thefollowing is a specification.

In printing-presses the paper is frequently fed in from a web, and it isperforated by re volving cutters, and the advancing sheet is pulled offwith an accelerated movement and passed into the press. This isespecially the case in printing-presses known as perfecting-presses.Difficulty, however, is experienced in passing in the advancing end ofthe sheet at exactly the right time and with the proper speed for thegrippers to seize such sheet and draw it in unobstructedly to the press.

The object of my present invention is to communicate to the paper amotion corresponding, or nearly so, to the movement of the grippers, sothat the sheet may be seized and moved forward with the advancing edgein exactly the proper position for the grippers to seize the same,thereby avoiding difficulties which have heretofore been experienced inconsequence of the belts and forwardingrollers exerting an unequaltension and i wrinkling the sheet or slipping upon the paper and causingthe momentary detention in the separating of the sheet and theforwarding of the same, so that the gripping device does not properlygrasp the sheet.

Although my improvements are especially adapted to perfectingprinting-presses they are available for feeding paper into folding orcutting machines, where accuracy in the movement of the paper is ofimportance.

In the drawings, Figure l. is a diagram illustrating the position andaction of my improvements with reference to the cutting and printingmechanism of a press, and Fig. 2 is an elevation of theforwarding-rollers near,

one end of the same.

The cutting-cylinders A B are of any usual character, and the cutteracts to perforate the sheet or web 0 to the proper extent, but not toentirely separate one sheet from the other, so that after theperforations have been made the web 0 passes on between the rollers D E,

that forward the same to the point of delivery, and F G are my improvednipping and forwarding rolls. The distance between the rolls D E and F Gis to be greater than the length of one sheet, so that after the web hasbeen perforated and the sheet passed be- J tween the rollers D E theadvancing end thereof will not receive the impulse from the nipping andforwarding rolls F G until the perforations have passed the rolls D E,so that such rolls D E may continue to forward impression-cylinder at L,and N are the grippers for seizing the advancing end of the sheet. Theseare of any known or desired character.

The peculiarity in the nipping and forwarding rolls F G consists in theforwarding-pads 2 2, applied upon the surfaces of one or both of saidrolls and in a line parallel with the axes, and I usually make the rollsF and. G of different diameter, for a purpose hereinafter named.

It is now to be understoodthat the advancing end of the sheetpassesalong'andbetwee'n the forwarding-rolls F G freely and at the same speedWith which the rolls D E are traveling; but the forwarding-rolls F G areto be traveling at the same surface speed,or nearly so, as theimpression-cylinder L and grippers N, and when the belts or tapes H Iare made use of they will move at the same speed, or nearly so, and slipagainst the sheet; but when the forwarding-pads 2 come in contact withthe sheet they nip the same and firmly hold it and impart to it the samespeed of movement as the grippers, and this is the case whether theforwarding-padsare upon both the rollers F G or only upon one roller,the parts being adjusted so that the forwarding-pads on one roll pressintimately into contact with the other roll in cases where theforwarding-pads are only on one roll; but it is preferable to have theforwarding-pads ICO on both rolls, so that the paper will not be actedupon except when the forwarding-pads coincide. As soon as theforwarding-pads act upon the sheet of paper and accelerate its movement,giving to the same a speed corresponding to the motion of the grippers,the forward end of the sheet will pass to the grippers and the grippershave ample time to swing and grasp the sheet before the forwarding-padscease their hold upon the same, and thereafter the sheet is free to bedrawn through between the forwarding rolls F and G after the pads ceasetheir hold upon the sheet. In cases where the speed of the Web of paperapproximates the speed of the grippers the forwarding-rolls F G may beof the same size, and the advancing end of the sheet of paper can passfreely through between such rolls F and G and will be in position forthe forwarding-pads to nip the same and accelerate the speed of thepaper, separating the sheet from the web and forward ing the paper intothe grippers, and no injury will result from the forwarding-pads nippingthe sheet two or more times in the revolution of the rolls F and G asthe sheet passes through between them, because the forwarding-pads aremoving at the same speed as the paper; but under many circumstances itis advisable to prevent the forwarding-pads from acting on the sheet ofpaper oftener than on the one occasion when the paper is forwarded intothegrippers; and with this object in view I make the forwarding-rolls Fand G of different diameters, so that while the gearing by which theyare actuated causes them to travel at the same surface speeds theforwardingpads on the two rolls will only coincide every givennumber ofrevolutions of the respective rolls. For instance, if the roll F isone-quarter larger than the roll G, the pads will coincide every roll For G, and this roll F or G is to bear such a proportion to the size ofthe impression-cylinder L that the nipping-pads will only operate wheneach set of grippers upon such impression-cylinder comes to the positionfor receiving the sheet, and in this manner the movements of theforwarding rolls and pads can be adapted to the press, whet-her there isonly one range of grippers upon the impression-cylinder or whether theremay be two or more ranges of such grippers, and the same conditions areavailable where this feeding apparatus is made use of in supplying paperto a folding or other machine, in which instance the paper may pass oversuitable bridges to a pair of forwarding-rolls, (shown by dotted linesat P,) and the parts are to be timed in such a way that the nipping-padswill act upon the sheet of paper and pass the advancing end thereof inbetween such rolls P at the propermoment.

I claim as my invention- 1. The forwarding-rolls F G, of differentdiameters and having pads partially surrounding them, in combinationwith the connecting-gearing and paper-supplying apparatus, substantiallyas specified.

2. The combination, with the cutting mechanism for perforating the webof paper and the rolls for forwarding such paper, of the rolls F G, ofdifferentdiameters, and the ranges of forwarding-pads 2 upon andpartially surrounding each roll, and gearing for connecting the rolls Fand G, so as to cause them to travel at the same surface speed, wherebythe nipping-pads will only operate when they coincide after two or morerevolutions of either roller F or G, substantially as set forth.

3. The combination, with the impressioncylinder L and grippers M, of theforwardingrolls F G and forwarding-pads 2 upon and partially surroundingsuch rolls for nipping the paper and imparting to the same a speedcorresponding to the movement of the grippers, or nearly so,substantially as set forth.

Signed by me this 18th day of March, 1889.

JOSEPH A. DEAR.

Witnesses:

GEO. T. PINCKNEY, WILLIAM G. MOTT.

